说明：  分给给出了预条件GAOR、GMTS、MAOR三种迭代法的数值算例，修改预条件矩阵，给定参数便可得到迭代矩阵谱半径
(To gives the preconditioned GAOR, GMTS and MAOR iterative method, a numerical example, modify the preconditioned matrix, given parameter iterative matrix spectral radius can be got to give the preconditioned GAOR, GMTS and MAOR iterative method, a numerical example, modify the preconditioned matrix, the given parameters of the spectral radius of iterative matrix can be got)